Vibrator.



F. P. TESSMER.

- VIBRAToR. APPLICATION FILED MAY I7. 1.915.

1,164,889. Y Patented 1160.211915.

UNITED STATES PATENT OFFICE.

FREDERICK P. TESSMER, 0F DETROIT, MICHIGAN.

VIBRATOR.

To all 'whom t may concern.'

Be it known that I, FREDER1o-. l". 'lrss- MER, a citizen of the UnitedStates of America, residing at Detroit,in the county of Wayne and Stateof Michigan, have invented certain new and useful Improvements inVibrators, of which the following is a specification, reference beinghad there-- in to the accompanying drawings.

This invention relates to vibrators, and the primary object of myinvention is to provide a vibrator that can be used on match plates,benches, tubs, core plates, etc., in the production of castings toinsure perfect size and weight, and save time compared to the method ofhand rapping usually resorted to.

Another object of this invention is to furnish a vibrator of the abovetype with adjustable means adapted to limit the stroke of the piston orplunger of the vibrator, and thereby obviate the necessity of usingvibrators of various sizes in connection with different types of molds.

A further object `of this invent-ion is to provide a novel, durable andinexpensive vibrator that can'be thoroughly cleaned and lubricated fromtime to time to maintain the same in an operable condition by whichvibrating effectiveness may be obtained.

With the above and other objects in view, the invention resides in thenovel construction, combination and arrangement of parts to behereinafter specifically described and then claimed.

Reference will now be had to the drawing,l

wherein- Figure 1 is a longitudinal sectional view of a vibrator, partlyin elevation; Fig. 2 is a cross sect-ional view, taken on line II-II ofFig. l, Fig. 3 is a plan ofthe vibrator, and Fig. 4 is a longitudinalcross Sectional View of the piston of the vibrator.

In the drawing, the reference numeral 1 denotes a cylinder having thebore 2 thereof enlarged at its ends to provide chambers 3. The ends ofthe cylinder are exteriorly screw-threaded, as at 4, and screwed uponthe outer end of said cylinder is a cap 5 having an apertured tongue ortang 6 by'which the vibrator is connected to a match plate or similarstructure. The cap 5 closes the outer end of the cylinder 1,`therebyclosing the chamber 3 at this end of the cylinder. The opposite end ofthe cylinder is provided with a cap 7 having 'flat facets 8 to facili-Specification of Letters Patent.

. the

Patented Dec. 21, 1915.

Application filed May 17, 1915. Serial No. 28,757.

` held in an adjusted position by a jam or lock nut 11 against the endof the cap. This adjustable screw regulates the stroke of a piston orplunger within the cylinder.

Reciprocable inthe bore 2 of the cylinder l is a piston 12 of lesslength than the bore 2, said piston having annular grooves 13 and 14.The outer end of the piston has a longitudinal port 15 in communicationwith the outer chamber 3 and with a transverse port 16 communicatingwith the groove 13 of the piston.-A The inner end of the piston has alongitudinal port 17 communicating with the inner chamber 3 and with atransverse port 18 communicating with the annular groove 14. The top ofthe cylinder 1 has a longitudinal enlargement 19 bored or drilled toprovide main air inlet ports 20 and 21, the latter being disposed ataright angle to the former for the convenience of making a desirable hoseor conduit connection. The main air inlet port 2,1 has been shown closedby a detachable plug 22 whereby the port 20 can be used. Communicatingwith the main air inlet ports is a longitudinal port 23 and branch ports24 and 25, said branch ports establishing communication between the mainair inlet ports and the bore 2 of the cylinder. The longitudinal port 23and the branch ports 24 and 25 are produced by drilling the enlargement19 and then plugging the outer ends of the ports with screws 26 orsimilar means.

The bottom of the cylinder is provided with exhaust ports`27 and 28 andwith a small enlargement 29 intermediate the ports. Secured to the smallenlargement 29 by a screw 30 or other fastening means is asemicylindrical shell or cover 31 having the side edges thereof engagingthe cylinder 1 and the ends of the shell or cover open. This shell orcover preventssand, dust or other matter from entering the bore 2 of thecylinder and said shell or cover also serves functionally as a mufflerfor the exhaust from orts 27 and 28. The inner end of the cap has arecess 32 affording a seat for a coiled compression spring 33 whichengages the inner end of the piston 12, the spring preventing accidentalshifting ,of the piston 12 and maintaining the same normally extended inthe cylinder with the groove 13 in communication with branch port 24 ofthe enlargement 19.

Assuming that the vibrator is connected to a suitable supply 0f airunder pressure, the air entering the main port 20 passes through theports 23 and 241 into the groove 13 and then throughthe ports 16 and 15in to the outer chamber 3 of the vibrator, the air forcing the piston toa retracted position. As the piston is shifted the air exhausts throughport 27 and the groove 14 is placed in communication with the port 25,whereby the'inner chamber 3 receives air which forces the piston 12 toan extended position,

the air from the inner chamber exhausting through port 28. In thismanner the piston 12 can be continuously reciprocated within thecylinder to tap and vibrate the cap 5, which is connected to a matchplate, core plate or similar structure to be vbrated.

While in the drawing there is illustrated a preferred embodiment of myinvention, it is to be understood that the structural elements aresusceptible to such variations and modifications as fall within thescope of the appended claim.

What I claim is A vibrator comprising a cylinder. provided with airinlet and exhaust ports, caps on the ends o f the cylinder, a piston.,reciprocable in said cylinder and adapted to impinge one i of said caps,a screw in the other cap adapt ed to limit the stroke of saidpiston,`and means engaging the same cap around the screw thereof adaptedt0 retainsaid piston in an operable position relative ,toy an air inletport of said cylinder..

In testimony whereof I aiixpiny-signature in presence of two witnesses.v

FREDERICK P. TESSMER.

Witnesses: f

OTTO F. BARTHEL, ANNA M. DoRR.

